[PATCH v3 10/13] don't check for unistd.h

[Joel Brobecker]

> Ok, I dug some more, and I discovered that the gnulib "strerror" module
> is the root of our trouble.  Dropping it fixes the problem.
> 
> Therefore I'm checking in the appended patch.  (I omitted all the
> auto-generated crud from it for clarity.)
> 
> I send a second note to bug-gnulib with my findings.

Thanks, Tom! As it turns out, I just received a build failure
notification when trying to cross-build GDBserver for WindRiver
Linux, precisely because of a problem inside strerror. Strange
that everything worked for all kinds of exotic platforms, and
then had to fail on a target that is supposed to be Linux...
Oh well.

-- 
Joel